Are there blood tests to check for bladder cancer?

No. Unfortunately, there are no blood tests to determine if one has bladder cancer. The only way to diagnose bladder cancer is by clinical history, various urine tests, and with a cystoscopy. This is a test where a telescope is placed into the bladder and the bladder is visually examined in its entirety to determine if there any masses or lesions on the bladder lining.
No. At present there are no clinically utilized blood tests for bladder cancer directly. Sometimes there can be indirect evidence on blood tests of bladder cancer such as anemia or elevated calcium levels but these are nonspecific.